Forbidden transitions in the infra-red spectra of tetrahedral anions—III. Spectra-structure correlations in perchlorates, sulphates and phosphates of the formula MXO4

Abstract

The spectra of 63 compounds have been recorded as mulls in Nujol and in hexachlorobutadiene and as alkali halide discs. The effect of site symmetry on the gross structure of the spectra and on the intensity of ν₁ is considered; the effect of perturbation by water molecules, and the possibility of covalent bonding in the compounds is also discussed.